Valve-spring lifter



Nov. 2 1926. 1,605,317

F. G. YAWMAN VALVE SPRING LIFTER Filed July 14. 1925 IINVENTOR.iirderz'ok 6- Yawnuuv:

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A TTORNEYS.

Patented Nov. 2, 1926.

UNITED STATES FREDERICK G. YAWMAN, OF ROCHESTER, YORK,

VALVE-SPRING LIFTER.

I Application filed J'u1y.14, 1925'. "Serial No. 43,507.

The present invention relates to valvespring lifters, and an objectthereof is to provide a construction which will be inexpensive tomanufacture and strong and durable in use, while atthe same time makingit possible to maintain a parallel relation between the jaws.

To this and other ends, the invention consists of certain parts andcombinations of parts, all of which will be hereinafter de scribed; thenovel features being pointed out in the appended claims.

.l n the drawings:

Fig. l. is a side view of the lifter showing it in position to lift thespring;

Fig. 2 is a section on the line 22, Fig. 4:;

Fig. 3 is a top plan view of the tool; and

Fig. 41 is a section on the line fir-4:, Fig. 2.

Referring more particularly to the drawings, 1 and 2 indicate two jawmembers formed of sheet-metal bent into channel form. Each jaw memberhas at one end a jaw 3 formed with a seat -1- which is adapted tocooperate either with the spring 5 of the valve or portion 6 about thevalve, as shown in F 1 of the drawings. Each of these jaw portions 3 hasan opening or recess 7 which is formed to surround the valve stem 8 andto permit the passage of the spring 30 abutment'pin therethrough. The awmembers are connected by two pairs of links 9, each pair being pivotedto one of the jaw members at 10 and having a sliding movement on theother jaw. Preferably the members of each pair of links lie on the outersides of the jaw members and the pivot 10 extends between them acrossthe channels of the jaw members. The other ends of each pair of linkshave a pivot member 11 connecting its members and operating in slots 12-formed in the channeled sides of the jaw members. Each pair of links ispivotally connected substantially midway between its ends with the otherpair of links so that there is obtained between the two jaw members aparallel motion. Preferably the pivotal connection between the two pairsof links is in the form of lateral projections 13 on opposite sides of abolt or screw member 14. This bolt or screw member extends looselythrough an opening 15 in an abutment member 16 which is engaged on itsouter face by a nut 17 adjustable on the screw member 14.

The abutment member 16 is ofchannel formation and has the side walls ofits channel formed at their edges on inclined sur-' faces 18. The endsof the abutment member extend into pockets formed at the ends of the jawmembers preferably by cutting away the bottom of the channel so that thesides of the channel project at 19 beyond the bottom of the channel andon opposite sides of the opposite ends of the abutment member 16.Preferably the bottom of the channel of a jaw member is deflectedlaterally at 20 for engagement with the surfaces 18.

From the foregoing it will be seen that the abutment piece for the nuthas a. sliding engagement with the ends of the jaw members which aremoveclin parallel lines away from each other by the link connectionbetween them. The surfaces of the abutment member engaging the ends ofthe jaw members are inclined with reference to the plane of the abutmentmember so that a great-er ease of actionbetween the abutment member andthe jaw members is secured, the jaw members moving toward the ends ofthe abutment member or down the inclines as they separate. The jawmembers are of channel construction and the bottom of each channel iscut away to provide a pocket or recess in which the abutment membermoves. The bolt is preferably rigid with and connected to the pivotalconnection between the links.

What I claim as my invention and desire to secure by Letters Patent is:

1. A valve-spring lifter comprising a pair of jaw members, two links,one pivoted to each jaw member and having a sliding connection with theother jaw member, a pivotal connection between the links, a boltconnected with the links at the pivotal connection, an abutment memberslidably mounted on both jaw members and through which the bolt extends,and a nut operating on the bolt and cooperating with the abutmentmember.

2. A valve-spring lifter comprising two j aw members provided withrecesses in their ends, two links, each pivoted to one of the jawmembers and having a slidable connection with the other jaw member,pivotal connection between the links, a bolt having connection with saidpivotal connection, an abutment member guided in the recesses in theends of'the jaw members and having an opening through which the boltextends, and a nut operating on the bolt and cooperating with saidabutment member.

Inc

Ill

3. A valve-spring lifter comprising a pair of aw members of channelconstruction, the bottom ot the channel bemg cut away at each end, sothat the sides of the channel project beyond the bottom, and the bottomof the channel adjacent said cutaway portion being bent laterally toprovide a seat, two links each pivoted to one of the jaw members andslidably connected to the other jaw member, a pivotal connection betweenthe links, a bolt secured to said pivotal connection, an abutment memberreceived between the sides of the channeled jaw members and engagingsaid seats, said abutment member having an opening through which thebolt extends and a nut operable on said bolt in FREDERICK G. YAWVMAN.

